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In garden peas, the allele for tall plants is dominant over the allele for short plants. A true-breeding tall plant is crossed with a short plant, and one of their offspring is test crosse of 60 offspring resulting from the test cross, about should be short. O 60 O 45 15 O 30 Mutations in a hypothetical gene S67 can lead to cancer when they reduce the expression of the gene. Thus, S67 likely produces a protein that is involved in O promoting necrosis in tissues. O suppressing cell division. O promoting cell division. causing aneuploidy. causing crossing over. Refer to the table. In tomatoes, tall is dominant to dwarf, and smooth fruits are dominant to hairy fruits. A plant homozygous for both dominant traits is crossed with a plant homozygous for both recessive traits. The F1 progeny are crossed with the following results: 93 tall with smooth fruits; 87 dwarf with hairy fruits; 11 tall with hairy fruits; and 9 dwarf with smooth fruits. Tall Dwarf Smooth 93 Hairy 11 87 These data indicate that the genes are O linked and show 20 percent recombination. on different chromosomes. linked and show 10 percent recombination. O linked and show 40 percent recombination. O linked and show 5 percent recombination.